Messages in this thread | | | Date | Fri, 6 Sep 2013 19:51:18 +0200 | From | Frantisek Hrbata <> | Subject | Re: [PATCH v2 4/4] kernel: add support for init_array constructors |
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On Fri, Sep 06, 2013 at 11:43:08AM +0930, Rusty Russell wrote: > Frantisek Hrbata <fhrbata@redhat.com> writes: > > This adds the .init_array section as yet another section with constructors. This > > is needed because gcc could add __gcov_init calls to .init_array or .ctors > > section, depending on gcc version. > > > > v2: - reuse mod->ctors for .init_array section for modules, because gcc uses > > .ctors or .init_array, but not both at the same time > > > > Signed-off-by: Frantisek Hrbata <fhrbata@redhat.com> > > Might be nice to document which gcc version changed this, so people can > choose whether to cherry-pick this change?
Thank you for pointing this out. As per gcc git this was introduced by commit ef1da80 and released in 4.7 version.
$ git describe --contains ef1da80 gcc-4_7_0-release~4358
Do you want me to post v3 with this info included in the descrition?
> > Acked-by: Rusty Russell <rusty@rustcorp.com.au>
Many thanks
> > > --- > > include/asm-generic/vmlinux.lds.h | 1 + > > kernel/module.c | 3 +++ > > 2 files changed, 4 insertions(+) > > > > diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h > > index 69732d2..c55d8d9 100644 > > --- a/include/asm-generic/vmlinux.lds.h > > +++ b/include/asm-generic/vmlinux.lds.h > > @@ -468,6 +468,7 @@ > > #define KERNEL_CTORS() . = ALIGN(8); \ > > VMLINUX_SYMBOL(__ctors_start) = .; \ > > *(.ctors) \ > > + *(.init_array) \ > > VMLINUX_SYMBOL(__ctors_end) = .; > > #else > > #define KERNEL_CTORS() > > diff --git a/kernel/module.c b/kernel/module.c > > index 2069158..bbbd953 100644 > > --- a/kernel/module.c > > +++ b/kernel/module.c > > @@ -2760,6 +2760,9 @@ static void find_module_sections(struct module *mod, struct load_info *info) > > #ifdef CONFIG_CONSTRUCTORS > > mod->ctors = section_objs(info, ".ctors", > > sizeof(*mod->ctors), &mod->num_ctors); > > + if (!mod->ctors) > > + mod->ctors = section_objs(info, ".init_array", > > + sizeof(*mod->ctors), &mod->num_ctors); > > #endif > > > > #ifdef CONFIG_TRACEPOINTS > > -- > > 1.8.3.1
-- Frantisek Hrbata
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